Much of the public believes that the mainframe is a dinosaur stuck in the "Mad Men" days, but programs such as MongoDB, which supports Linux on the mainframe, proves them wrong. A recent article, published on Linux.com, discusses the latest developments in mainframe databases.
From the article, Running MongoDB and Other Open Source Apps on the Mainframe:
Before the shift to Linux, mainframe users turned to the traditional RDBMS offerings such as Oracle and DB2. After the shift, users looked increasingly to open source apps, such as MongoDB.
Among the many fans and supporters of open source on mainframes is the Open Mainframe Project, a Linux Foundation effort aimed at increasing deployment and use of the Linux OS in mainframe computing. Members are eagerly embracing the shift to Linux and open source apps.